Did not download optional dependencies: pecl/igbinary

hello.

my development environment is ubuntu 14.04 LTS 32bit & php5-5.5.9 version.

i did not install.

# sudo wget -O/etc/apt/sources.list.d/couchbase.list http://packages.couchbase.com/ubuntu/couchbase-ubuntu1404.list
# wget -O- http://packages.couchbase.com/ubuntu/couchbase.key | sudo apt-key add -
# sudo apt-get update
# sudo apt-get install libcouchbase2-libevent libcouchbase-dev

# sudo apt-get isntall php-pear
# sudo apt-get install build-essential
# sudo pecl install couchbase
...
Did not download optional dependencies: pecl/igbinary, use --alldeps to download automatically
pecl/couchbase can optionally use package "pecl/igbinary"
downloading couchbase-1.2.2.tgz ...
Starting to download couchbase-1.2.2.tgz (84,607 bytes)
....................done: 84,607 bytes
could not extract the package.xml file from "/build/buildd/php5-5.5.9+dfsg/pear-build-download/couchbase-1.2.2.tgz"
Download of "pecl/couchbase" succeeded, but it is not a valid package archive
Error: cannot download "pecl/couchbase"
Download failed
install failed

why met this fail??
how i complete this install?

comment plz, ;(

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